Agilent 6814B Users Guide

User's Guide

AC Power Solutions

HP Models 6814B, 6834B, and 6843A

For instruments with Serial Numbers:

HP 6814B: 3601A-00101 through 00270

US36010101-up

HP 6834B: 3601A-00101 through 00140

US36010101-up

HP 6843A: 3540A-00101 through 00140

US35400101-up

HP Part No. 5962-0887 Printed in U.S.A.
Microfiche No 5962-0888 December, 1998

Warranty Information

CERTIFICATION

Hewlett-Packard Company certifies that this product met its published specifications at time of shipment from the
factory. Hewlett-Packard further certifies that its calibration measurements are traceable to the United States
National Bureau of Standards, to the extent allowed by the Bureau's calibration facility, and to the calibration facilities
of other International Standards Organization members.

WARRANTY

This Hewlett-Packard hardware product is warranted against defects in material and workmanship for a period of
three years from date of delivery. HP software and firmware products, which are designated by HP for use with a
hardware product and when properly installed on that hardware product, are warranted not to fail to execute their
programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery.
During the warranty period Hewlett-Packard Company will, at its option, either repair or replace products which
prove to be defective. HP does not warrant that the operation for the software firmware, or hardware shall be
uninterrupted or error free.

For warranty service, with the exception of warranty options, this product must be returned to a service facility
designated by HP. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products
returned to HP for warranty service. Except for products returned to Customer from another country, HP shall pay
for return of products to Customer.

Warranty services outside the country of initial purchase are included in HP's product price, only if Customer pays
HP international prices (defined as destination local currency price, or U.S. or Geneva Export price).

If HP is unable, within a reasonable time to repair or replace any product to condition as warranted, the Customer
shall be entitled to a refund of the purchase price upon return of the product to HP.

LIMITATION OF WARRANTY

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the
Customer, Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the
environmental specifications for the product, or improper site preparation and maintenance. NO OTHER
WARRANTY IS EXPRESSED OR IMPLIED. HP SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES

THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER'S SOLE AND EXCLUSIVE REMEDIES. HP SHALL
NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

ASSISTANCE

The above statements apply only to the standard product warranty. Warranty options, extended support contacts,
product maintenance agreements and customer assistance agreements are also available. Contact your nearest
Hewlett-Packard Sales and Service office for further information on HP's full line of Support Programs.

2

Safety Summary

The following general safety precautions must be observed during all phases of operation of this instrument.

Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety

standards of design, manufacture, and intended use of the instrument. Hewlett-Packard Company assumes no

liability for the customer's failure to comply with these requirements.

WARNING: LETHAL VOLTAGES

Ac sources can supply 425 V peak at their output. DEATH on contact may result if the output terminals or
circuits connected to the output are touched when power is applied.

GENERAL

This product is a Safety Class 1 instrument (provided with a protective earth terminal). The protective features of
this product may be impaired if it is used in a manner not specified in the operation instructions.

Any LEDs used in this product are Class 1 LEDs as per IEC 825-1.

ENVIRONMENTAL CONDITONS

This instrument is intended for indoor use in an installation category III, pollution degree 2 environment. It is
designed to operate at a maximum relative humidity of 95% and at altitudes of up to 2000 meters. Refer to the
specifications tables for the ac mains voltage requirements and ambient operating temperature range.

BEFORE APPLYING POWER

Verify that the product is set to match the available line voltage, the correct fuse is installed, and all safety
precautions are taken. Note the instrument's external markings described under "Safety Symbols".

GROUND THE INSTRUMENT

To minimize shock hazard, the instrument chassis and cover must be connected to an electrical ground. The
instrument must be connected to the ac power mains through a grounded power cable, with the ground wire
firmly connected to an electrical ground (safety ground) at the power outlet. Any interruption of the protective
(grounding) conductor or disconnection of the protective earth terminal will cause a potential shock hazard that
could result in personal injury.

ATTENTION: Un circuit de terre continu est essentiel en vue du fonctionnement sécuritaire de l'appareil.
Ne jamais mettre l'appareil en marche lorsque le conducteur de mise … la terre est d‚branch‚.

FUSES

Only fuses with the required rated current, voltage, and specified type (normal blow, time delay, etc.) should be
used. Do not use repaired fuses or short-circuited fuseholders. To do so could cause a shock or fire hazard.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

Do not operate the instrument in the presence of flammable gases or fumes.

DO NOT REMOVE THE INSTRUMENT COVER

Operating personnel must not remove instrument covers. Component replacement and internal adjustments must
be made only by qualified service personnel.

DO NOT EXCEED INPUT RATINGS

Operation at line voltages or frequencies in excess of those stated on the line rating label may cause leakage
currents in excess of 5.0 mA peak.

Instruments that appear damaged or defective should be made inoperative and secured against unintended
operation until they can be repaired by qualified service personnel.

3

SAFETY SYMBOLS

Direct current

Alternating current
Both direct and alternating current
Three-phase alternating current

Earth (ground) terminal

Protective earth (ground) terminal

Frame or chassis terminal

Terminal is at earth potential. Used for measurement and control circuits designed to be
operated with one terminal at earth potential.

Terminal for Neutral conductor on permanently installed equipment

Terminal for Line conductor on permanently installed equipment

WARNING

Caution

On (supply)

Off (supply)

Standby (supply). Units with this symbol are not completely disconnected from ac mains
when this switch is off. To completely disconnect the unit from ac mains, either disconnect
the power cord or have a qualified electrician install an external switch.

In position of a bi-stable push control

Out position of a bi-stable push control
Caution, risk of electric shock

Caution, hot surface

Caution (refer to accompanying documents)

The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like,
which, if not correctly performed or adhered to, could result in personal injury. Do not
proceed beyond a WARNING sign until the indicated conditions are fully understood and
met.

The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like,
which, if not correctly performed or adhered to, could result in damage to or destruction of
part or all of the product. Do not proceed beyond a CAUTION sign until the indicated
conditions are fully understood and met.

4

Declaration Page

Manufacturer's Name: Hewlett-Packard Company
Manufacturer's Address: 150 Green Pond Road

declares that the Product

Product Name: a) AC Power Source/Analyzer

Model Number(s): a) HP 6814A, 6814B, 6834A, 6834B

conforms to the following Product Specifications:

DECLARATION OF CONFORMITY

according to ISO/IEC Guide 22 and EN 45014

Rockaway, New Jersey 07866
U.S.A.

b) Harmonic/Flicker Test System

b) HP 6843A

Safety: IEC 1010-1:1990+A1(1992) / EN 61010-1:1993

EMC: CISPR 11:1990 / EN 55011:1991 - Group 1 Class A

Supplementary Information:

The product herewith complies with the requirements of the Low Voltage Directive
73/23/EEC and the EMC Directive 89/336/EEC and carries the CE-marking accordingly.

New Jersey January 1997 __ __
Location Date Bruce Krueger / Quality Manager

European Contact: Your local Hewlett-Packard Sales and Service Office or Hewlett-Packard GmbH,
Department TRE, Herrenberger Strasse 130, D-71034 Boeblingen (FAX:[phone])

IEC 801-2:1991 / EN 50082-1:1992 - 4 kV CD, 8 kV AD
IEC 801-3:1984 / EN 50082-1:1992 - 3 V / m
IEC 801-4:1988 / EN 50082-1:1992 - 0.5 kV Signal Lines
1 kV Power Lines

5

Acoustic Noise Information

Herstellerbescheinigung

Diese Information steht im Zusammenhang mit den Anforderungen der
Maschinenläminformationsverordnung vom 18 Januar 1991.

* Schalldruckpegel Lp <70 dB(A)
* Am Arbeitsplatz
* Normaler Betrieb
* Nach EN 27779 (Typprüfung).

Manufacturer's Declaration

This statement is provided to comply with the requirements of the German Sound Emission Directive,
from 18 January 1991.

* Sound Pressure Lp <70 dB(A)
* At Operator Position
* Normal Operation
* According to EN 27779 (Type Test).

Printing History

The edition and current revision of this manual are indicated below. Reprints of this manual containing
minor corrections and updates may have the same printing date. Revised editions are identified by a new
printing date. A revised edition incorporates all new or corrected material since the previous printing date.

Changes to the manual occurring between revisions are covered by change sheets shipped with the manual.
In some cases, the manual change applies only to specific instruments. Instructions provided on the change
sheet will indicate if a particular change applies only to certain instruments.

This document contains proprietary information protected by copyright. All rights are reserved. No part of
this document may be photocopied, reproduced, or translated into another language without the prior
consent of Hewlett-Packard Company. The information contained in this document is subject to change
without notice.

 Copyright 1996, 1998 Hewlett-Packard Company Edition 1 _________January, 1996

Edition 2 ________December, 1998

6

Table of Contents

Warranty Information 2
Safety Summary 3
Declaration Page 5
Acoustic Noise Information 6
Printing History 6
Table of Contents 7

1. GENERAL INFORMATION 9

Document Orientation 9
Safety Considerations 10
Options, Accessories, and User Replaceable Parts 10
Description 11

Capabilities 11

Front Panel/Remote Operation 12
Output Characteristic 12

Ranges 12
Output VA Capability 13

2. INSTALLATION 15

Inspection 15

Damage 15
Packaging Material 15
Items Supplied 15
Cleaning 15

Location 16

Bench Operation 16
Rack Mounting 16

Input Connections 17

Input Source and Line Fuse 17
Installing the Power Cord 17

Output Connections 18
Wire Considerations 19

Voltage Drops 19

Remote Sense Connections 20

OVP Considerations 21
Output Rating 21

Trigger Connections 21
Digital Connections 21
Controller Connections 22

HP-IB Connector 22
RS-232 Interface 23

3. TURN-ON CHECKOUT 27

Introduction 27
Preliminary Checkout 27
Using the Keypad 28
Checkout Procedure 28
In Case of Trouble 31

Error Messages 31

Line Fuse 31

7

4. FRONT PANEL OPERATION 33

Introduction 33
Front Panel Description 33
System Keys 35
Function Keys 36

Immediate Action Keys 36
Scrolling Keys 37
Meter Display Keys 37
Output Control Keys 38
Protection and Status Control Keys 40
Trigger and List Control Keys 41

Entry Keys 42
Examples of Front Panel Programming 43

1 - Setting the Output Voltage Amplitude 43
Procedure for Three-Phase AC Sources 44
2 - Setting the Output Frequency 45
3 - Setting a Protection Feature 45
4 - Using Transient Voltage Modes 46
5 - Trigger Delays and Phase Synchronization 49
6 - Using Slew Rates to Generate Waveforms 52
7 - Measuring Peak Inrush Current 54
8 - Setting the HP-IB Address and RS-232 Parameters 55
9 - Saving and Recalling Operating States 55
10 - Switching Between Single- and Three-phase Operation (HP 6834B only) 56

A. SPECIFICATIONS 57

Specifications 57
Supplemental Characteristics 58

B. VERIFICATION AND CALIBRATION 61

Introduction 61

Equipment Required 61
Test Setup 62

Performing the Verification Tests 62

Turn-On Checkout Procedure 62
Voltage Programming and Measurement Accuracy 63
RMS Current Readback Accuracy 63

Performing the Calibration Procedure 64

Front Panel Calibration Menu 65

Front Panel Calibration 65

Enable Calibration Mode 65
Calibrating and Entering Voltage Calibration Values 66
Calibrating and Entering Current Calibration Values 67
Calibrating the Output Impedance (HP 6843A only) 68
Saving the Calibration Constants 68

Changing the Calibration Password 69
Calibration Error Messages 69
Calibration Over the HP-IB 69

HP Calibration Program Listing 69

C. ERROR MESSAGES 73

Error Number List 73

INDEX 77

8

1

General Information

Document Orientation

This manual describes the operation of the HP 6814B/6834B/6843A AC Power Solutions. These units will
be referred to as "ac sources" throughout this manual. Operation of the HP 6843A is described for normal
mode operation only. The following documents are shipped with your ac source:

♦ a Quick-Start Guide, to help you quickly get started using the ac source
♦ a User's Guide, containing detailed installation, checkout, and front panel information
♦ a Programming Guide, containing detailed HP-IB programming information
♦ a Quick Reference Card, designed as a memory jogger for the experienced user
♦ Regulatory Test Solution User's Guides are shipped with HP 6843A units only

You will find information on the following tasks in these guides. Refer to the table of contents of each guide
for a complete list of the topics.

Topic Location

Accessories and options Chapter 1 - this guide
Calibrating the ac source Appendix B - this guide
Front panel keys Chapter 4 - this guide
Front panel programming examples Chapter 4 - this guide
Line voltage connections Chapter 2 - this guide
Line voltage ratings Appendix A - this guide
Operator replaceable parts Chapter 1 - this guide
Operator troubleshooting Chapter 3 - this guide
Operating characteristics Appendix A - this guide
Performance specifications Appendix A - this guide
Quick operating checkout Chapter 3 - this guide
Rack mounting Chapter 2 - this guide
RS-232 operation Chapter 2 - this guide
SCPI programming examples Chapter 3 - Programming Guide
SCPI programming commands Chapter 4 - Programming Guide
Turn-on/checkout Chapter 3 - this guide
Wiring - discrete fault indicator (DFI) Chapter 2 - this guide

- HP-IB controller Chapter 2 - this guide

- load or loads Chapter 2 - this guide

- voltage sensing (local and remote) Chapter 2 - this guide

- remote inhibit (RI) Chapter 2 - this guide

1 - General Information

Safety Considerations

This ac source is a Safety Class 1 instrument, which means it has a protective earth terminal. That terminal
must be connected to earth ground through a power source equipped with a ground receptacle. Refer to the
Safety Summary page at the beginning of this guide for general safety information. Before installation or
operation, check the ac source and review this guide for safety warnings and instructions. Safety warnings
for specific procedures are located at appropriate places in the guide.

Options, Accessories, and User Replaceable Parts

Table 1-1. Options

Option Description

400 Input power 360-440 Vac, three-phase, 47-63 Hz
1CM 2- Rack mount kit (HP 5062-3977)

Support rails (HP 5064-0001) are required (rails are not included in rack mount kit).

Table 1-2. Accessories

Item HP Part Number

Fuse replacement kits
30A for 180-235 Vac, 3-phase line
HP-IB cables

0.5 meters (1.6 ft)

1.0 meter (3.3 ft)

2.0 meters (6.6 ft)

3.0 meters (13.2 ft)

Heavy duty slide mount kit

5060-3513

10833D
10833A
10833B
10833C

5063-2310

Table 1-3. User Replaceable Parts List

Description HP Part No.

Rack mount kit See “Options”
Slide mount kit See “Accessories”
7-terminal sense connector plug 1252-3698
Sense connector cover 4040-2268
4-terminal digital connector plug 1252-1488
AC input safety cover (with strain relief and brushing) 5001-9837

Screw (4), ac input safety cover (6-32 x 1.5in) 2360-0405
Screw (8), ac input barrier block (8-32 x 5/16in) N/A

AC output safety cover 5001-9811

Screw (2), ac output safety cover (6-32 x .3in) 2460-0012
Screw (8), ac output barrier block (10-32 x .37in) N/A

Fuse safety cover 5001-9810

Screw (2), fuse safety cover (6-32 x .3in) 2460-0012
User’s Guide (this manual) 5962-0887
Programming Guide 5962-0889
Quick Start Guide 5962-0883
Quick Reference Card 5962-0885
Appropriate HP Regulatory Test Solution Software HP 14761A, HP 14762A, HP 14763A

10

General Information - 1

Description

The ac source combines three instruments in one unit as shown in the following figure. The function
generator produces waveforms with programmable amplitude, frequency, and shape. The power amplifier
amplifies the function generator signal to produce the ac power for your application. The measurement
functions range from a simple readback of rms voltage and current, to sophisticated capabilities such as
waveform analysis.

DAC

WAVEFORM

GENERATOR

SOURCE

BIPOLAR

AMPLIFIER

shunt

MEASUREMENT

BLOCK

POWERMETER
FFT ANALYZER

Figure 1-1. AC Source Functional Elements

The following model ac power sources are described in this User's Guide:

Model Description

HP 6814B 3000 VA single –phase operation
HP 6834B 1500 VA/ phase for three-phase operation

(4500 VA for single-phase operation)

HP 6843A 4500 VA single-phase operation

Capabilities

♦ Programmable ac voltage, dc voltage, frequency, phase, and current limit.
♦ Sine, square, clipped sine, and user-definable waveforms.
♦ Voltage and frequency slew control.
♦ Synthesized waveform generation for high resolution and accuracy in frequency, low waveform

distortion, and glitch-free phase transitions.

♦ Step and pulse output transients for generating surge, sag, dropout, and other line disturbance

simulations.

♦ Nonvolatile list programming for generating complex output transients or test sequences.
♦ Three-phase/single-phase output capability (HP 6834B only)
♦ Extensive measurement capability:

• Ac rms, dc, ac+dc voltage and current and peak current.

• Real, reactive, and apparent power.

• Harmonic analysis of voltage and current waveforms gives amplitude, phase, and total

harmonic distortion results up to the 50th harmonic.

• Triggered acquisition of digitized voltage and current with extensive post-acquisition

calculations.

• Additional total power and neutral curent measurementts in the three-phase model.

• All measurements made with 16-bit resolution.

♦ Trigger In and Trigger Out for synchronizing transient events or measurements with external

signals.

♦ Front panel control with 14-character vacuum flourescent display, keypad, and rotary pulse

generators for voltage and frequency settings.

♦ Built-in HP-IB and RS-232 interface programming with SCPI command language.

11

1 - General Information

♦ Nonvolatile state and waveform storage and recall.
♦ Over-voltage, over-power, over-current, over-temperature, and RI/DFI protection features.
♦ Built-in output and sense disconnect relays.
♦ Extensive selftest, status reporting, and software calibration.

Front Panel/Remote Operation

The front panel has both rotary (RPG) and keypad controls for setting the output voltage and frequency.
The panel display provides digital readouts of a number of output measurements. Annunciators display the
operating status of the ac source. System keys let you perform system functions such as setting the HP-IB
address and recalling operating states. Front panel Function keys access the ac source function menus.
Front panel Entry keys let you select and enter parameter values. Refer to chapter 4 for a complete
description of the front panel controls.

Remotely programming is accomplished from either the HP-IB bus or from an RS-232 serial port. HP-IB
and RS-232 programming uses SCPI commands (Standard Commands for Programmable Instruments) that
make the ac source programs compatible with those of other instruments. AC source status registers permit
remote monitoring of a wide variety of ac source operating conditions

NOTE: Refer to the ac source Programming Guide for further information about remotely

programming the ac source. If you are using the HP 6843A, refer to the appropriate
Regulatory Test Solution User’s Guide for information about regulatory testing.

Output Characteristic

Ranges

The ac source’s output characteristic is shown in the following figure. The output voltage of the ac source
may be adjusted to any value within the range of the unit. On three-phase units, each phase can be adjusted
independently of the other two.

Rated output VA and conversion efficiency is greatest when the output voltage is set near maximum. For
this reason, the ac source is designed to operate on one of two ranges: 150 volts full-scale, or 300 volts full­scale. You should choose the range that allows you to operate nearest the full-scale output capability of the
selected range.

12

Vrms

300 V

150 V

General Information - 1

See Figure 1-3

0

5A 10A (6834B 3phase)
15A 30A (6834B 1phase)
10A 20A (6814B)
16A 32A (6843A)

Irms

Figure 1-2. AC Source Output Characteristic (in real-time mode)

Output VA Capability

The output capability of each output phase is limited by VA (volts-amps) rather than power (watts). The
amount of VA available to a load can be determined by examining figure 1-3, the output power curve. This
curve rates the available VA versus output voltage. Full VA is available only at a full-scale voltage. Full
current is available at voltages between 50% and 100% of the output voltage range. Appendix A
documents the ac source's specifications and supplemental characteristics.

NOTE: The load on the ac source may draw full VA at any power factor between 0 and 1, and

may draw maximum current with a crest factor of 4 (3 for HP 6843A). If the load draws
current in excess of the maximum rated rms or peak current, the voltage amplitude will be
clipped to prevent excessive internal power dissipation.

100

90

80

70

60

50

40

30

20

OUTPUT VA, PERCENT OF MAXIMUM

10

0

OUTPUT VOLTAGE, PERCENT OF RANGE

Figure 1-3. AC Source VA Capabilities

70 80 90 10010 20 30 40 50 60

13

2

Installation

Inspection

Damage

When you receive your ac source, inspect it for any obvious damage that may have occurred during
shipment. If there is damage, notify the shipping carrier and the nearest HP Sales and Support Office
immediately. The list of HP Sales and Support Offices is at the back of this guide. Warranty information
is printed in the front of this guide.

Packaging Material

Until you have checked out the ac source, save the shipping carton and packing materials in case the unit
has to be returned. If you return the ac source for service, attach a tag identifying the model number and the
owner. Also include a brief description of the problem.

Items Supplied

Check that the following items are included with your ac source. Some items are installed in the unit.

Power Cord

Sense/Digital connector

Safety covers

Manuals

Change page

A power cord appropriate for your location. The cord may or may not be terminated
in a power plug (see "Options" in chapter 1). If the cord is not included, contact your
nearest HP Sales and Support Office (refer to the list at the back of this guide).

a 4-terminal digital plug that connects to the back of the unit.
a 7-terminal sense plug that connects to the back of the unit.

Ac input cover with strain relief
Ac output cover
Fuse cover

User’s Guide
Programming Guide
Quick Start Guide
Quick Reference Card
Regulatory Test Solutions Guides (supplied with HP 6843A units)

If applicable, change sheets may be included with this guide. If there are change
sheets, make the indicated corrections in this guide.

Cleaning

Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not attempt to
clean internally.

WARNING: To prevent electric shock, unplug the unit before cleaning.

2 - Installation

Location

Refer to the Safety Summary page at the beginning of this manual for safety-related information about
environmental conditions.

WARNING: HP 6814B units weigh 79.5 kg (175 lbs.)

HP 6834B/ 6843A units weigh 87.7 kg (193 lbs.)
Obtain adequate help when moving the unit or mounting the unit in the rack.

Bench Operation

The outline diagram in figure 2-1 gives the dimensions of your ac source. The feet may be removed for
rack mounting. Your ac source must be installed in a location that allows sufficient space at the sides and
back of the unit for adequate air circulation. Minimum clearances are 1 inch (25 mm) along the sides. Do

not block the fan exhaust at the rear of the unit.

Rack Mounting

The ac source can be mounted in a standard 19-inch rack panel or cabinet. Rack mounting kits are
available as Option 1CM or 1CP. Installation instructions are included with each rack mounting kit

CAUTION: HP 6814B/ 6834B/ 6843A units require instrument support rails for non-stationary

installations. These are normally ordered with the cabinet and are not included with the
rack mounting kits.

TOP

574.7mm

22.6"

425.5mm

16.75"

REAR

12.7mm

0.5"

262.6mm

10.3"

19.1mm

0.8"
SIDE

266.7mm

10.5"

16

Figure 2-1. Outline Diagram

Installation - 2

Input Connections

Input Source and Line Fuse

The ac source requires a 3-phase power service that provides 7350 VA (6000 W) maximum. The power
service should have a current rating greater than or equal to the ac source's circuit breaker rating. The ac
source has a delta input (no neutral connection) and will accept power from either delta (triangle) or wye
(star) services.

CAUTION: Two input voltage ranges are available (see "AC Input Ratings" in appendix A). The ac

source will be damaged if it is operated at an input voltage that is outside of its configured
input range.

In order to maintain phase current balancing, the power service should be a dedicated line with only HP
6814B/6834B/6843A ac sources drawing current from it. A disconnect box located near the ac source is

recommended for all installations and is mandatory for direct-wired installations.

Installing the Power Cord

WARNING: Installation of the power cord must be done by a qualified and licensed electrician and

must be in accordance with local electrical codes.

The power cords supplied with the ac source do not include a power plug. Terminating connectors and a
ground lug are attached to one end of the cord. See Figure 2-2 while performing the following procedure.

1. Check the line fuses as follows:

a. Examine the FUSES label on the rear panel.
b. Remove the safety cover in front of the fuse caps.
c. Unscrew the line fuse caps from the rear panel and verify that all fuses are as

specified on the label. Reinstall the fuses.

d. Reinstall the safety cover in front of the fuse caps.

2. Remove the ac input cover from the back of the unit.

3. Open the line clamp on the ac input cover and insert the line cord through the opening.

4. Position the power cord so that the clamp is near the end of the outside insulating sheath
on the power cord. Tighten the screws to secure the clamp.

5. Secure the three ac lines to the ac power strip as follows:

Phase 1 to L1 (black).
Phase 2 to L2 (red).
Phase 3 to L3 (orange).

6. Secure the ground wire (green) to the chassis earth ground terminal.

7. Slip the safety cover over the ac input terminal strip and secure the cover with the four
screws.

8. If required, wire the appropriate power plug to the other end of the power cord. For user­made cables, strip back the sheath 10 cm (4 in).

17

2 - Installation

2

CAUTION

LINE RATING

WARNING

F 1

F 2 F 3

1

5

WARNING

L 2 L 3

L 1

6

7

3

4

10cm (4 in.)

Figure 2-2. Connecting the Power Cord

Output Connections

The power output terminal block has a termination for each of the output phases (φ1, φ2, φ3 ) and a
floating neutral line (COM) for the phase return connections. A separate earth ground terminal (⊥) is
located near the output terminals.

18

These screw terminals are
internally connected in
single-phase mode only
(when NOUPUTS = 1)

HP 6834B HP 6814B / 6843A

φ

1

These screw terminals

φ 2

are internally connected
on HP 6843A units

φ

3

COM

These screw terminals
are internally connected
on HP 6814B units

⊥

Figure 2-3. Output Connections

φ

COM

⊥

1

Installation - 2

NOTE: To minimize the possibility of instability on the output, keep load leads as short as possible

bundle or twist the leads tightly together to minimize inductance

Wire Considerations

Current Ratings

Fire Hazard To satisfy safety requirements, load wires must be large enough not to overheat when

carrying the maximum short-circuit current of the ac source. If there is more than one
load, then any pair of load wires must be capable of safely carrying the full-rated
current of the ac source.

Table 2-1 lists the characteristics of AWG (American Wire Gage) copper wire.

Table 2-1. Ampacity and Resistance of Stranded Copper Conductors

AWG No. Ampacity

14 25 0.0103 6 80 0.0016
12 30 0.0065 4 105 0.0010
10 40 0.0041 2 140 0.00064

8 60 0.0025 1/0 195 0.00040

1. Ampacity is based on 30°C ambient temperature with conductor rated at 60°C. For ambient
temperature other than 30°C, multiply the above ampacities by the following constants:

Temp. (°C)

21-25 1.08 41-45 0.71
26-30 1.00 46-50 0.58
31-35 0.91 51-55 0.41
36-40 0.82

2. Resistance is nominal at 75 °C wire temperature.

1

Resistance

(Ω/m)

Constant

2

NOTES:

AWG No. Ampacity

Temp. (°C) Temp. (°C)

1

Resistance

(Ω/m)

2

Voltage Drops

The load wires must also be large enough to avoid excessive voltage drops due to the impedance of the
wires. In general, if the wires are heavy enough to carry the maximum short circuit current without
overheating, excessive voltage drops will not be a problem. The voltage drops across the load wires should
be limited to less than 2% of the output voltage.

Refer to Table 2-1 if you need to calculate the voltage drop for some commonly used AWG copper wire.

19

2 - Installation

Remote Sense Connections

Under normal operation, the ac source senses the output voltage at the output terminals on the back of the
unit. External sense terminals are available on the back of the unit that allow the output voltages to be
sensed at the load, compensating for impedance losses in the load wiring. As shown in the following figure:

♦ Connect the phase 1 (φ1) through phase 2 (φ) sense terminals to the side of the load that connects

to the corresponding output terminal.

♦ Connect the Neutral (COM) sense terminal connector to the neutral side of the load.
♦ Twist and shield all signal wires to and from the sense connectors.

The sense leads are part of the ac source's feedback path and must be kept at a low resistance in order to
maintain optimal performance. Connect the sense leads carefully so that they do not become open-circuited.
If the sense leads are left unconnected or become open during operation, the ac source will regulate at the
output terminals, resulting in a 3% to 5% increase in output over the programmed value.

Set the ALC command to EXT (external) to enable remote sensing. The ALC command is located under
the Voltage key as explained in chapter 4. Set the ALC command to INT (internal) to disable remote
sensing.

NOTE: Phase 2 and phase 3

connections are not available
on HP 6814B/6843A units.

φ

φ 2

φ

COM

1

3

⊥

COM φ 3 φ 2 φ 1

φ

1 LOAD

φ 2

LOAD

φ

3 LOAD

20

Figure 2-4. Remote Sense Connections

Installation - 2

OVP Considerations

The overvoltage protection circuit senses voltage near the output terminals, not at the load. Therefore the
signal sensed by the OVP circuit can be significantly higher than the actual voltage at the load. When using
remote sensing, you must program the OVP trip voltage high enough to compensate for the voltage drop
between the output terminals and the load.

Output Rating

In remote sense applications, the voltage drop in the load leads subtracts from the available load voltage
(see "Remote Sensing Capability" in appendix A). As the ac source increases its output to overcome this
voltage drop, the sum of the programmed voltage and the load-lead drop may exceed the ac source's
maximum voltage rating. This will not damage the unit, but may trip the OV protection circuit, which
senses the voltage at the output terminals.

Trigger Connections

The BNC trigger connectors on the rear panel let you apply trigger signals to the ac source as well as
generate trigger signals from the ac source. The electrical characteristics of the trigger connectors are
described in appendix A. More information on programming external triggers is found in chapter 4 of the
ac source Programming Guide.

Trigger IN Allows negative-going external trigger signals to trigger the ac source.
Trigger OUT Generates a negative-going pulse when the selected transient output has occurred.

Digital Connections

This connector, which is on the rear panel, is for connecting the fault and the inhibit signals. The fault
(FLT) signal is also referred to as the DFI signal in the front panel and SCPI commands. The inhibit (INH)
signal is also referred to as the RI signal in the front panel and SCPI commands.

The connector accepts wires sizes from AWG 22 to AWG 12. Disconnect the mating plug to make your
wire connections. The electrical characteristics of the digital connectors are described in appendix A. More
information on programming the digital connectors is found in chapter 4 of the ac source Programming
Guide.

NOTE: It is good engineering practice to twist and shield all signal wires to and from the digital

connectors

The following examples show how you can connect the FLT/INH circuits of the ac source.
In example A, the INH input connects to a switch that shorts pin + to pin ⊥ whenever it is necessary to

disable output of the unit. This activates the remote inhibit (RI) circuit, which turns off the ac output. The
front panel Prot annunciator comes on and the RI bit is set in the Questionable Status Event register. To re­enable the unit, first open the connection between pins + and ⊥ and then clear the protection circuit. This
can be done either from the front panel or over the HP-IB/RS-232.

21

2 - Installation

In example B, the FLT output of one unit is connected to the INH input of another unit. A fault condition
in one of the units will disable all of them without intervention either by the controller or external circuitry.
The controller can be made aware of the fault via a service request (SRQ) generated by the Questionable

FLT INH

I

+

-

+

-

. . . .

NOTE: Connectors

are removable

I

+

-

+

-

FLT INH

+

-

+

. . . .

I

+

-

+

-

FLT Output

I

-

INH Input

I

+

-

+

-

INH Input

A) INH Example with One Unit

INH Common

Switch

(Normally

Open)

INH Input

FLT Output

B) FLT Example with Multiple Units

Status summary bit.

Figure 2-5. FLT/INH Examples

Controller Connections

The ac source connects to a controller either through an HP-IB or an RS-232 connector.

HP-IB Connector

Each ac source has its own HP-IB bus address. AC sources may be connected to the bus in series
configuration, star configuration, or a combination of the two. You may connect from 1 to 15 ac sources to
a controller HP-IB interface.

NOTE: The ac source is shipped from the factory with its HP-IB address set to 5. This address can

be changed as described in chapter 4 of this guide.

22

Installation - 2

RS-232 Interface

The ac source provides an RS-232 programming interface, which is activated by commands located under
the front panel Address key. When the RS-232 interface is selected, the HP-IB interface is disabled.

NOTE: Sending or receiving data over the RS-232 interface when not configured for REMOTE

operation can cause unpredictable results. Always make sure the ac source is configured
for remote operation when using the RS-232 interface.

Interface Commands

All SCPI commands are available through RS-232 programming. The SYSTem:LOCal,
SYSTem:REMote, and SYSTem:RWLock commands are only available through the RS-232 interface.

SYSTem:LOCal Places the ac source in local mode during RS-232 operation.The front panel keys

are functional.

SYSTem:REMote Places the ac source in remote mode during RS-232 operation. All front panel

keys except the Local key are disabled.

SYSTem:RWLock Places the ac source in remote mode during RS-232 operation. All front panel

keys including the Local key are disabled.

RS-232 Data Format

♦ constant 11-bit data format
♦ one start bit
♦ seven data bits plus a parity bit (even or odd parity), or eight data bits without parity

(parity bit is "0")

♦ two stop bits

You can specify one of the following baud rates: 300 600 1200 2400 4800 9600

NOTE: The ac source always uses one start bit and two stop bits regardless of the baud rate. The

number of start and stop bits is not programmable.

RS-232 Connector

The RS-232 connector is a DB-9, male connector. You can connect the ac source to any computer or
terminal with a properly configured DB-25 connector. You can use a standard HP 24542G or 24542H
interface cable.

Table 2-2. RS-232 Connector

1 2 3 4 5

6 7 8 9

Pin

1
2
3
4
5
6
7
8
9

Input/Output

Output

Input
Output
Output

Common

Input

Output

Description

Reserved for service use
Receive Data (RxD)
Transmit Data (TxD)
Data Terminal Ready
(DTR)
Signal ground
Data Set Ready (DSR)
no connection
no connection
Reserved for service use

23

2 - Installation

Hardware Handshake

The RS-232 interface uses the DTR (data terminal ready) line as a holdoff signal to the bus controller.
When DTR is true, the bus controller may send data to the ac source. When DTR goes false, the bus
controller must stop sending data within 10 characters, and must not send any more data until DTR goes
true again. The ac source sets DTR false under two conditions.

1. When the input buffer is full (approximately 100 characters have been received), it will set DTR
false. When enough characters have been removed to make space in the input buffer, DTR will be
set to true, unless condition 2 (see below) prevents this.

2. When the ac source wants to "talk", which means that it has processed a query, and has seen a
<newline> message terminator, it will set DTR false. This implies that once a query has been sent
to the power source, the bus controller should read the response before attempting to send more
data. It also means that a <newline> must terminate the command string. After the response has
been output, the ac source will set DTR true again, unless condition #1 prevents this.

The ac source monitors the DSR (data set ready) line to determine when the bus controller is ready to
accept data. It checks this line before each character is sent, and the output is suspended if DSR is false.
When DSR goes true, transmission will resume. The ac source will leave DTR false while output is
suspended. A form of deadlock exists until the bus controller asserts DSR true to allow the ac source to
complete the transmission.

Control-C is the equivalent to the HP-IB device clear command. It clears the operation in progress and
discards any pending output. For the control-C character to be recognized by the power source while it
holds DTR false, the bus controller must first set DSR false.

Null modem RS-232 interface cables swap the DTR and DSR lines as shown in the following figure. For
other bus controllers or languages, you must determine what form of hardware handshake is used. You may
have to build a customized cable to connect the holdoff lines as necessary. If your bus controller does not
use hardware handshaking, tie the DSR input to the ac source to a signal that is always true. This implies
that your bus controller must always be ready to accept data. You may want to set the baud rate toeither
2400 or 4800 baud to ensure that this is true.

bus controller

TxD (3)

RxD (2)
*DTR (4)
*DSR (6)

Ground (5)

ac source

TxD (3)

RxD (2)
DTR (4)
DSR (6)

Ground (5)

24

Figure 2-7. Null Modem Interface Lines